Improvement in obtaining madder extracts



to settle.

, tinitzt fitter j am can.

ALFRED PARAF, OF NEW YORK, 'N. Y., ASSIGNOR TO EDWARD'SA BINE RENWIOK, TRUSTEE, OF SAME PLACE.-

IMPROVEMENT IN OBTAIN ING MADDER EXTRACTS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern;

Be it known that I, ALFRED PARAF, of France, now residing in the city, county, and State of New York, have made an invention of a new and useful Improvement in the Process of Obtaining Maddcr Extract for dyeing and printing by the use of oils; and that the following is a full, clear, and exact description and specification of my said invention. r

The object of this invention is to obtain an aque ous solution of the coloring matter of madder directly from the crude-madder material without intermediate precipitation-0f the coloring matter.

The crudemadder material that is preferred for this process is damp acid garancinc, by which is meant garancine in the damp acid condition in which it ex ists after it has-been washed, and before the freeacid v in it has been neutralized with chalk.

The process may be practicedas follows: Mix one part by weight of damp acid garancine with four parts of kerosene-or refined oil of petroleum,

in a copperboile'r, which can be heated externallyby steam. Boil the mixture for three-quarters of an hour. Shut oh the steam and permit the mixture Draw oil the solution and filter it Boil the material in the boiler a second time with four additionalparts of the oil for half an hour, and separate the solution as above directed. Boil the material in the boiler a third time with four additional parts of refined petroleum and separate the solution as before. Place the residuum remaining in the boiler in bags, and press them. Filter Sthecxpressed solution, and add to it the filtered solutions obtained as above directed.

Oasks or vats are provided, to each of which a steam-pipe with a stop-cock is fitted, so that the contents of the casks can be boiled by blowing steam into them. These casks or vats are filled nearly half full with water, and common soap in shaving is added to the water in the proportion of. three-quarters of a pound to'every gallon of water.

The liquid is boiled by'letting in steam until the soap is dissolved.

solution, obtained as above described, and cqualto Then a quantity of the filtered oil' the soap solution in each cask or vat, is added thereto, and the whole is thoroughly agitated, after which the mixture is permitted to' settle. In these operations the coloring matter leaves the oil and combines with the soap solution, leaving the oil floating at the top. The oil may then be separated by decanting the oil or by drawing off the soap solution. .This soap solution is the aqueous solution of the coloring matter of the madder, and may be used for dyeing and printing fibrous and textile articles.

If its color be not sufficiently deep, it may be charged with additional quantities of coloring matter by applying to it, while boiling hot, additional charges of the oil solutiouhbove described, the mixture being agitated and permitted to settle after each application of a charge of oil solution, and the oil being afterward scparated'as above described. 1 This charging of the soap solutionwith the coloring matterof the madder may be continued until'the soap solution becomes saturated with the coloring matter, so as to obtain a very concentrated compoundot' the soap and madder extract, which may be used to make dark or light printing-colors, according as agreater or lesser quantity of it is used.

Although I prefer treating the madder material with kerosene to obtain the oil solution, there are other oils that may be used for the purpose, as, for example, oil of turpentine, sometimes called spirits of turpentine, cotton-seed oil, and sunflower oil.

\Vhat I claim as the invention to be secured by Letters Patent, 'is' The process of "manufacturing an aqueous solution of madder extract fromthe madder material by means of oil and soap solution without intermediate precipitation,-substzmtially as before set forth.

. In testimony whereof I have hereto set my hand this 14th day of June, A. D. 1870.

' ALFRED PARAIE.

Witnesses:

' J UnIUs Gnnson,

Joan Ensrwoon. i 

